Preparation method of composite polymer electrolyte membrane

A technology of composite polymer and electrolyte membrane, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, and final product manufacturing. It can solve the problems of battery charge and discharge performance degradation, affect battery performance, and battery explosion, and improve compatibility. , the formation of inhibition, the effect of improving interface performance

Inactive Publication Date: 2015-05-27
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active metal lithium is easy to chemically react with the polymer electrolyte to form lithium dendrites when in contact, causing battery charge and discharge performance degradation, life shortening, and even safety issues such as fire and explosion.
When polymer electrolytes are used in lithium-ion batteries, they need to have good electrochemical stability, otherwise the decomposition of the electrolyte will not only affect the performance of the battery, but also cause the danger of battery explosion

Method used

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  • Preparation method of composite polymer electrolyte membrane
  • Preparation method of composite polymer electrolyte membrane
  • Preparation method of composite polymer electrolyte membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 After process optimization, use mixed lithium salt (LiTFSI+LiPF 6 )

[0037] 1. Preparation of composite polymer electrolyte membrane. 0.72g polymethyl methacrylate (M w =550,000), 0.18g polyethylene oxide (M w =300,000) were mixed and dissolved in 15ml of tetrahydrofuran solvent, 0.055g of nano-alumina powder was added, and ultrasonically stirred at 30°C for 1 hour. Move to a magnetic stirrer at 40°C and continue stirring for 4 hours until the solution is uniform and viscous, then add 0.117 g of lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) and continue stirring at 40°C for 20 hours. Stand still for 5 minutes to obtain a uniform viscous mixed solution.

[0038] Use a 20ml syringe to take 15ml of film-forming liquid and pour it into the mold, leaving a small hole, and dry it in vacuum at room temperature for 24 hours, then raise the temperature to 55°C-80°C, keep it for 24-48 hours, and finally turn off the vacuum drying oven to heat it. Let it sit f...

Embodiment 2

[0042] Example 2 After process optimization, mixed lithium salt (LiClO 4 +LiPF 6 )

[0043] 1. Preparation of composite polymer electrolyte membrane. 0.72g polymethyl methacrylate (M w =550,000), 0.18g polyethylene oxide (M w =300,000) were mixed and dissolved in 15ml of tetrahydrofuran solvent, 0.055g of nano-alumina powder was added, and ultrasonically stirred at 30°C for 1 hour. Move to a magnetic stirrer at 40°C and continue to stir for 4 hours until the solution is uniform and viscous, then add lithium perchlorate (LiClO 4 ) 0.065 g and continued stirring at 40° C. for 20 hours. Stand still for 5 minutes to obtain a uniform viscous mixed solution.

[0044] Use a 20ml syringe to take 15ml of film-forming liquid and pour it into the mold, leaving a small hole, and dry it in vacuum at room temperature for 24 hours, then raise the temperature to 55°C-80°C, keep it for 24-48 hours, and finally turn off the vacuum drying oven to heat it. Let it sit for half an hour and p...

Embodiment 3

[0048] Example 3 After process optimization, use mixed lithium salt (LiTFSI+LiPF 6 ) without adding nanoparticles

[0049] 1. Preparation of composite polymer electrolyte membrane. 0.72g polymethyl methacrylate (M w =550,000), 0.18g polyethylene oxide (M w =300,000) were stirred and dissolved in 15 ml of tetrahydrofuran solvent at a stirring temperature of 40° C. for 4 hours. When the solution was uniform and transparent, 0.117 g of lithium bistrifluoromethanesulfonimide was added and stirring was continued at 40° C. for 20 h. Stand still for 5 minutes to obtain a uniform viscous mixed solution.

[0050] Use a 20ml syringe to take 15ml of the film-forming solution and cast it into a petri dish (75mm in diameter), and quickly place it in a 30°C, -0.08MPa vacuum oven and cover it with white paper with small holes to dry for 24 hours. Turn off the heating in the vacuum drying oven and let it stand for half an hour. Use tweezers to peel off the dried polymer electrolyte from...

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Abstract

The invention discloses a preparation method of a composite polymer electrolyte membrane. The preparation method comprises the following steps: dissolving a polymer matrix in a solvent, then adding nanometer oxide, carrying out ultrasonic dispersion for 15-60 minutes while stirring at the temperature of 25-45 DEG C, and then stirring for 3-6h at the temperature of 25-45 DEG C to obtain a homogeneous system; then adding first lithium salt into the homogeneous system, further stirring for 16-24h, and drying for 12-24h to obtain a membrane liquid; and finally, carrying out membrane preparation on the membrane liquid to obtain the composite polymer electrolyte membrane. When or before the composite polymer electrolyte membrane is mounted in a battery, an electrolyte solution containing second lithium salt is added to form a mode of mixed lithium salt. According to the preparation method disclosed by the invention, the composite polymer electrolyte membrane is good in interfacial properties and electrochemical properties, is nonflammable, can not leak and is simple in preparation process, wide in raw material source, excellent in interfacial compatibility and good in electrochemical stability window.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and in particular relates to a preparation method of a solid composite polymer electrolyte membrane. Background technique [0002] Due to its high energy density, high output voltage, long cycle life, and low environmental pollution, lithium-ion batteries are widely used in digital electronic products such as mobile phones and tablets. The field of energy vehicles has shown broad prospects and strong development momentum, and it is a very promising electrochemical energy storage device. However, in recent years, there are common reports about safety accidents caused by lithium-ion batteries, and its safety issues have attracted the attention of many researchers. [0003] Liquid electrolyte is a type of electrolyte that is widely used in commercial lithium-ion batteries at this stage, but the safety problems caused by liquid leakage limit the further development and application o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L33/12C08L71/02C08K3/22C08K3/36H01M10/058
CPCY02E60/10Y02P70/50
Inventor 梁波唐思绮江清柏李胜良陈栩闫薛卉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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